Indices of centered heptagonal numbers (A069099) which are also centered triangular numbers (A005448).

A253477

Indices of centered heptagonal numbers (A069099) which are also centered triangular numbers (A005448).

Terms

    a(0) =1a(1) =10a(2) =46a(3) =1045a(4) =5005a(5) =114886a(6) =550450a(7) =12636361a(8) =60544441a(9) =1389884770a(10) =6659338006a(11) =152874688285a(12) =732466636165

External references